If the school books are truly too easy and she gets nothing out of them, I would not subject her to that. Sometimes you have to put your foot down. You have little control as to what they force her to do at school, but no one can force you to comply at home, esp. at this age where if she is graded, the grades don't really matter. I wouldn't say anything about it (unless the teacher grills you), I would just fail to follow instructions.